FileSystem clusterFS = sourceListing.getFileSystem(conf);
Path sortedSourceListing = DistCpUtils.sortListing(clusterFS, conf, sourceListing);
// Similarly, create the listing of target-files. Sort alphabetically.
Path targetListing = new Path(sourceListing.getParent(), "targetListing.seq");
CopyListing target = new GlobbedCopyListing(new Configuration(conf), null);
List<Path> targets = new ArrayList<Path>(1);
Path targetFinalPath = new Path(conf.get(DistCpConstants.CONF_LABEL_TARGET_FINAL_PATH));
targets.add(targetFinalPath);
DistCpOptions options = new DistCpOptions(targets, new Path("/NONE"));
target.buildListing(targetListing, options);
Path sortedTargetListing = DistCpUtils.sortListing(clusterFS, conf, targetListing);
long totalLen = clusterFS.getFileStatus(sortedTargetListing).getLen();
SequenceFile.Reader sourceReader = new SequenceFile.Reader(
clusterFS, sortedSourceListing, conf);